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A deformed aluminum-lithium-copper-zinc alloy and its preparation method

A technology for deforming aluminum and alloys, applied in the field of deformed aluminum-lithium-copper-zinc alloy and its preparation, can solve the problems of reduced fracture toughness of alloys, low zinc content, low fracture toughness of alloys, etc.

Active Publication Date: 2021-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (Patent No. 201380023370.0) discloses a new 2xxx aluminum-lithium alloy comprising 3.5-4.4wt.% Cu, 0.45-0.75wt.% Mg, 0.45-0.75wt.% Zn, 0.65-1.15wt. %Li, the alloy is an aluminum-lithium alloy with low zinc content, the Zn / Mg mass fraction ratio is between 0.60-1.67, and the alloy requires that the magnesium content is less than 1%, but the fracture toughness of the alloy is low
The Chinese patent (patent number 201810444457.X) discloses a high-strength toughness extruded aluminum-lithium alloy with high Zn content and its preparation method. The components in the alloy are: Zn 4.1-5.5%, Cu 2-4.5%, Mg 2-3%, Li 1-2%, Zr 0.1-0.5%, but the magnesium content in the alloy exceeds 2%, which will cause a large amount of T1 phase to precipitate at the grain boundary, reducing the strength of the grain boundary, thus making the alloy Decreased fracture toughness

Method used

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  • A deformed aluminum-lithium-copper-zinc alloy and its preparation method

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Effect test

Embodiment 1

[0040] The composition and weight percentage of the alloy are 1%Li-4.25%Cu-0.5%Mg-0.2%Zr-0.27%Mn-1.05%Zn-0.35%Ag-0.05%Ti, and the mass fraction ratio of Zn / Mg is 2.1 . The preparation method is as follows: first put pure aluminum and Al-Cu master alloy into a smelting furnace to melt, the melting temperature is 800 °C, and use hexachlorohexane (C 2 Cl 6 ) degassing and slag removal; then add Al-Zr master alloy, Al-Mn master alloy, Al-Ti master alloy to melt, adopt C 2 Cl 6 Degassing and slag removal; cool down to 780°C, add pure zinc, pure magnesium, pure silver and melt, use argon to degas and remove slag; then add 30 parts of LiCl, 60 parts of KCl and 10 parts of AlF on the surface of the melt 3 The formed molten salt covering agent is filled with argon to protect the melt; then pure lithium is pressed into the above molten alloy melt, and the C 2 Cl 6 Combining degassing and deslagging refining with argon, standing still; cooling to 700°C and casting under the protecti...

Embodiment 2

[0042] The composition and weight percentage of the alloy are 1%Li-4%Cu-1%Mg-0.2%Zr-0.3%Mn-3%Zn-0.1%Ti-0.1%Ag, and the mass fraction ratio of Zn / Mg is 3 . The preparation method is as follows: first put pure aluminum and Al-Cu master alloy into a smelting furnace to melt, the melting temperature is 750 °C, and use hexachlorohexane (C 2 Cl 6 ) degassing and slag removal; then add Al-Zr master alloy, Al-Mn master alloy, Al-Ti master alloy to melt, adopt C 2 Cl 6 Degassing and slag removal; cool down to 740°C, add pure zinc, pure magnesium and pure silver and melt, use argon to degas and remove slag; then add 40 parts of LiCl, 50 parts of KCl and 2 parts of AlF on the surface of the melt 3 The formed molten salt covering agent is filled with argon to protect the melt; then pure lithium is pressed into the above molten alloy melt, and the C 2 Cl 6 Combining degassing and slag refining with argon, let stand; cool down to 710°C and cast into shape under the protection of argon....

Embodiment 3

[0044] The composition and weight percentage of the alloy are 1%Li-3%Cu-1%Mg-0.2%Zr-0.25%Mn-6%Zn-0.1%Ti-0.3%Ag, and the mass fraction ratio of Zn / Mg is 6 . The preparation method is as follows: first put pure aluminum and Al-Cu master alloy into a smelting furnace to melt, the melting temperature is 750 °C, and use hexachlorohexane (C 2 Cl 6 ) degassing and slag removal; then add Al-Zr master alloy, Al-Mn master alloy, Al-Ti master alloy to melt, adopt C 2 Cl 6 Degassing and slag removal; cool down to 750°C, add pure zinc, pure magnesium, pure silver and melt, use argon to degas and remove slag; then add 30 parts of LiCl, 45 parts of KCl and 5 parts of AlF on the surface of the melt 3 The formed molten salt covering agent is filled with argon to protect the melt; then pure lithium is pressed into the above molten alloy melt, and the C 2 Cl 6 Combined with argon for degassing and deslagging refining, let stand; cool down to 730°C and cast into shape under the protection of...

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Abstract

The invention relates to a deformed aluminum-lithium-copper-zinc alloy and a preparation method thereof. The alloy includes the following components in mass percentage: Li: 1-2%, Cu: 3-5%, Zn: 1.05-6%, Mg: 0.5-1%, Ag: 0.1-0.5%, Mn: 0.1 ~0.3%, Zr: 0.1~0.3%, Ti: 0.05~0.1%, the balance is Al, and the mass ratio of Zn to Mg is not less than 2. The preparation method is as follows: according to the designed distribution ratio of aluminum alloy components, weigh each component, first melt other components except lithium source according to the designed sequence, and press pure lithium into the aluminum alloy under the environment of covering agent and protective gas In the alloy melt, it is refined by degassing and deslagging, standing and casting, and then undergoes homogenization annealing, hot extrusion deformation, and solid solution aging treatment. The invention prepares a product with better performance than the existing deformed aluminum-lithium alloy, and the product has the characteristics of high strength, high hardness, high fracture toughness, heat treatment strengthening and the like.

Description

technical field [0001] The invention relates to a deformed aluminum-lithium-copper-zinc alloy and a preparation method thereof, belonging to the technical field of metal material preparation. Background technique [0002] Adding 1wt% Li to the aluminum alloy can reduce the density of the alloy by 3%, while the modulus of elasticity can be increased by 6%, and it has a good solid solution strengthening effect. Therefore, Al-Li alloys have the advantages of low density, high specific strength and specific stiffness, excellent low temperature performance and corrosion resistance, and good superplasticity. Replacing conventional aluminum alloys with aluminum-lithium alloys can reduce the structural mass by 10% to 15%, and increase the rigidity by 15% to 20%. It is an ideal aerospace structural material. With the development of my country's aerospace industry, new aluminum alloys continue to develop, and the manufacturing methods of aluminum alloys have also been optimized and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/18C22C21/10C22C1/03C22F1/057C22F1/053
CPCC22C1/03C22C21/10C22C21/18C22F1/053C22F1/057
Inventor 肖代红吴名冬周鹏飞陈炜斌刘文胜
Owner CENT SOUTH UNIV
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